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function CutSample(M_, options_, estim_params_)
% function CutSample()
% Takes a subset from metropolis
%
% INPUTS
% options_ [structure]
% estim_params_ [structure]
% M_ [structure]
%
% OUTPUTS
% none
%
% SPECIAL REQUIREMENTS
% none
% Copyright (C) 2005-2012 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
npar = estim_params_.np+estim_params_.nvn+estim_params_.ncx+estim_params_.ncn+estim_params_.nvx;
% Get the path to the metropolis files.
MetropolisFolder = CheckPath('metropolis',M_.dname);
% Get the (base) name of the mod file.
ModelName = M_.fname;
% Load the last mh-history file.
load_last_mh_history_file(MetropolisFolder, M_.fname);
% Get the list of files where the mcmc draw are saved.
mh_files = dir([ MetropolisFolder ,filesep, M_.fname '_mh*.mat' ]);
if ~length(mh_files)
error('Estimation::mcmc: I can''t find MH file to load here!')
end
TotalNumberOfMhFiles = sum(record.MhDraws(:,2));
TotalNumberOfMhDraws = sum(record.MhDraws(:,1));
MAX_nruns = ceil(options_.MaxNumberOfBytes/(npar+2)/8);
FirstDraw = max(1,floor(options_.mh_drop*TotalNumberOfMhDraws));
FirstMhFile = ceil(FirstDraw/MAX_nruns);
FirstLine = FirstDraw-(FirstMhFile-1)*MAX_nruns;
record.KeepedDraws.FirstMhFile = FirstMhFile;
record.KeepedDraws.FirstLine = FirstLine;
if (TotalNumberOfMhFiles-1)-(FirstMhFile+1)+1 > 0
record.KeepedDraws.Distribution = [ MAX_nruns-FirstLine+1 ; ...
ones((TotalNumberOfMhFiles-1)-(FirstMhFile+1)+1,1)*MAX_nruns ; ...
record.MhDraws(end,3) ];
elseif TotalNumberOfMhFiles == 1
record.KeepedDraws.Distribution = [];
elseif TotalNumberOfMhFiles == 2 && FirstMhFile > 1
record.KeepedDraws.Distribution = [MAX_nruns-FirstLine+1 ; record.MhDraws(end,3)];
end
% Save updated mh-history file.
update_last_mh_history_file(MetropolisFolder, ModelName, record);
fprintf('Estimation::mcmc: Total number of MH draws: %d.\n',TotalNumberOfMhDraws);
fprintf('Estimation::mcmc: Total number of generated MH files: %d.\n',TotalNumberOfMhFiles);
fprintf('Estimation::mcmc: I''ll use mh-files %d to %d.\n',FirstMhFile,TotalNumberOfMhFiles);
fprintf('Estimation::mcmc: In MH-file number %d I''ll start at line %d.\n',FirstMhFile,FirstLine);
fprintf('Estimation::mcmc: Finally I keep %d draws.\n',TotalNumberOfMhDraws-FirstDraw);
skipline()
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